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Wallston 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Wallston

The Vale Of Glamorgan, United Kingdom

Long range weather outlook for Wallston includes 14 day forecast summary:

Taking a look at Wallston over the coming two weeks and the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 19°C expected on the evening of Friday 17th. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Thursday 23rd at 9°C. The next 14 days will have some days seeing a little precipitation and some days with rain. Predictions are Thursday 23rd will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Fri 17
May
00:00

W
W

1 / 3 kts 55 / 56°F 87%
Low level cloud: 2%
Mid level cloud: 26%
High level cloud: 8%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

0 / 1 kts 52 / 53°F 89%
Low level cloud: 12%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

1 / 2 kts 55 / 55°F 89%
Low level cloud: 14%
Mid level cloud: 46%
High level cloud: 74%
Most Significant Cloud Type: medium
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

5 / 6 kts 61 / 58°F 84%
Low level cloud: 41%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

3 / 4 kts 64 / 62°F 73%
Low level cloud: 4%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

1 / 1 kts 66 / 64°F 66%
Low level cloud: 11%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

1 / 2 kts 66 / 64°F 73%
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 21%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

3 / 7 kts 60 / 58°F 86%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 5%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

NNW
NNW

3 / 6 kts 54 / 54°F 89%
Low level cloud: 5%
Mid level cloud: 42%
High level cloud: 100%
Most Significant Cloud Type: medium
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

3 / 7 kts 53 / 53°F 90%
Low level cloud: 17%
Mid level cloud: 41%
High level cloud: 32%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

3 / 5 kts 56 / 55°F 91%
Low level cloud: 67%
Mid level cloud: 43%
High level cloud: 71%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

7 / 9 kts 62 / 60°F 86%
Low level cloud: 72%
Mid level cloud: 22%
High level cloud: 5%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

8 / 11 kts 65 / 63°F 79%
Low level cloud: 58%
Mid level cloud: 21%
High level cloud: 21%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

9 / 12 kts 66 / 64°F 78%
Low level cloud: 62%
Mid level cloud: 15%
High level cloud: 12%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

5 / 8 kts 65 / 63°F 86%
Low level cloud: 77%
Mid level cloud: 24%
High level cloud: 2%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

5 / 10 kts 60 / 58°F 90%
Low level cloud: 70%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NNE
NNE

6 / 12 kts 56 / 54°F 92%
Low level cloud: 2%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

6 / 10 kts 54 / 51°F 92%
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

6 / 11 kts 53 / 50°F 91%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

9 / 11 kts 60 / 57°F 76%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

9 / 11 kts 64 / 63°F 69%
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

8 / 12 kts 66 / 65°F 63%
Low level cloud: 21%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

7 / 11 kts 66 / 64°F 75%
Low level cloud: 3%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

5 / 7 kts 64 / 62°F 87%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NE
NE

5 / 8 kts 54 / 52°F 91%
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

6 / 11 kts 50 / 47°F 94%
Low level cloud: 30%
Mid level cloud: 1%
High level cloud: 2%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

7 / 9 kts 52 / 48°F 92%
Low level cloud: 28%
Mid level cloud: 1%
High level cloud: 3%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

11 / 13 kts 58 / 54°F 77%
Low level cloud: 13%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

10 / 12 kts 63 / 62°F 72%
Low level cloud: 44%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

9 / 12 kts 65 / 63°F 68%
Low level cloud: 27%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

6 / 9 kts 64 / 62°F 76%
Low level cloud: 13%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

5 / 9 kts 57 / 54°F 85%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NE
NE

5 / 8 kts 53 / 51°F 89%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 12%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

4 / 8 kts 49 / 47°F 88%
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 7%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

3 / 5 kts 52 / 49°F 81%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

3 / 3 kts 58 / 57°F 71%
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 8%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

2 / 3 kts 61 / 60°F 70%
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

3 / 4 kts 63 / 61°F 71%
Low level cloud: 31%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

5 / 7 kts 58 / 57°F 82%
Low level cloud: 7%
Mid level cloud: 84%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

5 / 10 kts 58 / 54°F 88%
Low level cloud: 0%
Mid level cloud: 56%
High level cloud: 7%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

WNW
WNW

6 / 12 kts 51 / 49°F 93%
Low level cloud: 6%
Mid level cloud: 46%
High level cloud: 35%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

6 / 12 kts 50 / 47°F 92%
Low level cloud: 4%
Mid level cloud: 43%
High level cloud: 96%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

6 / 9 kts 54 / 51°F 90%
Low level cloud: 11%
Mid level cloud: 47%
High level cloud: 33%
Most Significant Cloud Type: medium
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

9 / 11 kts 60 / 56°F 79%
Low level cloud: 30%
Mid level cloud: 44%
High level cloud: 14%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

11 / 12 kts 63 / 61°F 77%
Low level cloud: 39%
Mid level cloud: 67%
High level cloud: 9%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

14 / 17 kts 62 / 60°F 77%
Low level cloud: 23%
Mid level cloud: 7%
High level cloud: 14%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

11 / 14 kts 58 / 54°F 85%
Low level cloud: 27%
Mid level cloud: 14%
High level cloud: 9%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

6 / 10 kts 53 / 49°F 95%
Low level cloud: 27%
Mid level cloud: 17%
High level cloud: 15%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

WNW
WNW

5 / 9 kts 50 / 48°F 94%
Low level cloud: 31%
Mid level cloud: 17%
High level cloud: 66%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

5 / 9 kts 49 / 46°F 94%
Low level cloud: 28%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

3 / 4 kts 52 / 50°F 88%
Low level cloud: 82%
Mid level cloud: 23%
High level cloud: 15%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

4 / 4 kts 58 / 56°F 80%
Low level cloud: 77%
Mid level cloud: 26%
High level cloud: 12%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

3 / 4 kts 60 / 60°F 76%
Low level cloud: 80%
Mid level cloud: 40%
High level cloud: 10%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

0 / 0 kts 62 / 60°F 79%
Low level cloud: 60%
Mid level cloud: 43%
High level cloud: 82%
Most Significant Cloud Type: low
84%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NE
NE

1 / 3 kts 62 / 60°F 82%
Low level cloud: 15%
Mid level cloud: 43%
High level cloud: 80%
Most Significant Cloud Type: medium
87%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNE
NNE

3 / 7 kts 57 / 55°F 86%
Low level cloud: 2%
Mid level cloud: 41%
High level cloud: 21%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Fri 24
May
00:00

N
N

2 / 6 kts 56 / 56°F 92%
Low level cloud: 59%
Mid level cloud: 7%
High level cloud: 37%
Most Significant Cloud Type: low
65%
0.0 In
06:00

NNE
NNE

4 / 8 kts 52 / 51°F 83%
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 100%
Most Significant Cloud Type: medium
62%
0.0 In
12:00

ENE
ENE

12 / 26 kts 60 / 60°F 86%
Low level cloud: 82%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

E
E

8 / 18 kts 62 / 62°F 84%
Low level cloud: 14%
Mid level cloud: 11%
High level cloud: 6%
Most Significant Cloud Type: low
18%
0.0 In
Sat 25
May
00:00

NNE
NNE

8 / 16 kts 55 / 52°F 94%
Low level cloud: 93%
Mid level cloud: 14%
High level cloud: 6%
Most Significant Cloud Type: low
98%
0.0 In
06:00

W
W

5 / 11 kts 55 / 53°F 84%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

ENE
ENE

14 / 29 kts 62 / 62°F 82%
Low level cloud: 70%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.0 In
18:00

W
W

10 / 21 kts 59 / 59°F 91%
Low level cloud: 48%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: low
64%
0.0 In
Sun 26
May
00:00

ENE
ENE

11 / 23 kts 56 / 52°F 95%
Low level cloud: 65%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: low
86%
0.0 In
06:00

WSW
WSW

6 / 13 kts 57 / 56°F 98%
Low level cloud: 87%
Mid level cloud: 60%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.1 In
12:00

E
E

13 / 27 kts 62 / 62°F 84%
Low level cloud: 71%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.1 In
18:00

W
W

9 / 19 kts 63 / 63°F 83%
Low level cloud: 35%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
Mon 27
May
00:00

NE
NE

3 / 7 kts 58 / 58°F 93%
Low level cloud: 16%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.2 In
06:00

WNW
WNW

2 / 5 kts 60 / 60°F 82%
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 2%
Most Significant Cloud Type: medium
22%
0.0 In
12:00

NE
NE

10 / 22 kts 61 / 61°F 79%
Low level cloud: 63%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
18:00

W
W

9 / 20 kts 62 / 62°F 88%
Low level cloud: 21%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
Tue 28
May
00:00

NE
NE

5 / 11 kts 56 / 54°F 92%
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 9%
Most Significant Cloud Type: medium
50%
0.0 In
06:00

SSW
SSW

5 / 11 kts 58 / 58°F 97%
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

5 / 11 kts 63 / 63°F 66%
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 7%
Most Significant Cloud Type: medium
25%
0.0 In
18:00

NW
NW

10 / 22 kts 54 / 50°F 80%
Low level cloud: 26%
Mid level cloud: 13%
High level cloud: 2%
Most Significant Cloud Type: low
31%
0.3 In
Wed 29
May
00:00

NE
NE

5 / 11 kts 59 / 58°F 90%
Low level cloud: 20%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
06:00

WNW
WNW

8 / 18 kts 49 / 44°F 86%
Low level cloud: 11%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
12:00

ENE
ENE

7 / 16 kts 65 / 65°F 72%
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: low
12%
0.0 In
18:00

W
W

10 / 22 kts 55 / 51°F 78%
Low level cloud: 20%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
Thu 30
May
00:00

NE
NE

7 / 14 kts 57 / 56°F 92%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
13%
0.0 In
06:00

WNW
WNW

4 / 8 kts 53 / 52°F 84%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

ENE
ENE

11 / 24 kts 64 / 64°F 73%
Low level cloud: 32%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
32%
0.0 In
18:00

W
W

8 / 17 kts 57 / 55°F 77%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 99%
Most Significant Cloud Type: medium
8%
0.0 In
Fri 31
May
00:00

NE
NE

10 / 21 kts 55 / 52°F 91%
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
06:00

S
S

13 / 27 kts 51 / 46°F 93%
Low level cloud: 100%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NE
NE

12 / 27 kts 64 / 64°F 68%
Low level cloud: 25%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
18:00

WSW
WSW

11 / 24 kts 57 / 55°F 93%
Low level cloud: 51%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.3 In
Sat 01
Jun
00:00

NNE
NNE

6 / 13 kts 55 / 54°F 90%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
8%
0.0 In
06:00

SW
SW

6 / 14 kts 50 / 47°F 86%
Low level cloud: 88%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.0 In
12:00

NNE
NNE

10 / 22 kts 65 / 65°F 60%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
0.0 In
18:00

SW
SW

10 / 20 kts 56 / 53°F 81%
Low level cloud: 3%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
52%
0.1 In

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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Local Time

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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Speed/
Gust

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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Precip Amount

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
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Cloud Amount

Here we try to capture the feel of the weather as an image – it will never be perfect but is useful for a quick overview.
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Weather

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
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Pressure